 body,div,ul,li,ol,dt,dd,dl,p,h1,h2,h3,h4,input,textarea{
     margin:0;
     padding:0;
     list-style: none;
 }
body{
    background-color: #fff;
    box-sizing: border-box;
}
.to_Top{
    width: 36px;
    height: 64px;
    position: fixed;
    right: 0;
    bottom: 0;
    display: none;
}
.logo{
    width: 900px;
    height: 100px;
    margin: 0 auto;
    text-align: center;
}
.nav{
    width: 100%;
    height: 100px;
    position: absolute;
    left: 0;
    top: 100px;
}

 .nav_content{
    width: 900px;
    height: 100px;
    margin: auto;
    line-height: 100px;
    text-align: center;
}
 .nav_logo{
     width: 130px;
     height: 100px;
     margin-right:8px;
     float: left;
 }
.nav_logo img{
    width: 130px;
    height: 50px;
    vertical-align: middle;
    opacity: 0;
}
.nav_seach{
    height: 100px;
    line-height: 100px;
    float: left;
}
.nav_seach form{
    width: 100%;
    height: 100px;
    line-height: 100px;

}

.nav_seach input:first-child {
    width: 530px;
    height: 50px;
    border: 1px solid #ccc;
}
 .nav_seach input:last-child{
    width: 100px;
    height: 50px;
    border:none;
    margin-left:-10px;
    background-color: orangered;
   }
 .content{
     width: 900px;
     height: 1000px;
     margin:0 auto;
     margin-top:105px;
     border: 1px solid #ccc;
 }
 .content .header{
     width:900px;
     height: 50px;
     border-bottom: 1px solid #ccc;
     margin:0 auto;
 }
 .content .header li{
     float: left;
     padding:0px 50px;
     line-height: 50px;
     font-size:12px;

 }
 .cur{
     background-color: #666;
 }
 .content .body{
     display: none;
 }
 .content .active{
     display: block;
 }

 .body li{
     height:44px;
     line-height:44px;
     padding-left:10px;
     border-bottom: 1px solid #ccc;
 }

 .body .del,.detail {
     float: right;
     color: darkblue;
     margin-right: 10px;
 }